Olivia Holt and Katherine McNamara give Seventeen all the deets on their new Disney movie. Plus, what they love most about Halloween!

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Olivia Holt:Girl Vs. Monster is a Halloween movie that's never been done before. My character, Skyler, finds out her parents are monster hunters and she's a fifth-generation monster hunter. She accidentally releases some of the monsters her parents have captured, and her friends have to figure out a way to save Halloween.

Katherine McNamara: It's about overcoming your fears and being loyal to your friends. Skylar accidentally lets the monsters out when she sneaks out of the house to go to a party! Everyone has to bond together to save each other's lives.

KM: Oh gosh, there are so many. We are all friends for life after this. I bought all the girls these rings that say "Friends" on them and Olivia and I wear ours literally every day. One of my favorite memories is of a girls' night we had: We all got together for a sleepover. We made white chedder popcorn and spent hours making silly videos on my computer. Then, we fell asleep to Legally Blonde!

17: One last very important question. What's your favorite Halloween candy?

OH: I have an obsession with Milk Duds. Eating them tastes like heaven. So, I'll probably be getting a lot of Milk Duds for Halloween!